AirHint found the following cheapest return flights from Lisbon (LIS) to Oslo (OSL) in September 2025 (see full year).

Return flights

17 Sep - 21 Sep	Ryanair
26 Sep - 30 Sep	easyJet
23 Sep - 30 Sep	easyJet
23 Sep - 08 Oct	Ryanair
16 Sep - 23 Sep	Vueling Airlines
30 Sep - 15 Oct	easyJet
18 Sep - 22 Sep	Ryanair
12 Sep - 15 Sep	easyJet
09 Sep - 22 Sep	Vueling Airlines
19 Sep - 23 Sep	easyJet
12 Sep - 16 Sep	easyJet
04 Sep - 08 Sep	easyJet
24 Sep - 01 Oct	Ryanair
25 Sep - 11 Oct	Norwegian Air Sweden AOC
29 Sep - 02 Oct	easyJet
24 Sep - 11 Oct	Vueling Airlines
25 Sep - 08 Oct	Norwegian Air Sweden AOC
18 Sep - 08 Oct	Norwegian Air Sweden AOC
13 Sep - 01 Oct	Vueling Airlines
29 Sep - 04 Oct	KLM

Also check the deals for one-way flights from Lisbon to Oslo in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Lisbon to Oslo in September from 130€

Return flights